Answer:
6 pineapple, 6 melons, 8 grapefruits
Explanation:
3.25P + 2.75M + 0.5G = 40
P = M
6M + 0.5G = 40
Let M = 6
6(6) + 0.5G = 40
0.5G = 4
G = 8
P = 6
M = 6
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